Beyond3D’s first C++ AMP focused contest accepts submissions until August 31, 2012. The contest’s goal is to use parallel programming in order to speed up solving the Traveling Salesman’s Problem. All relevant details are provided on the contest’s dedicated page.

## Beyond3D C++ AMP contest

June 25th, 2012## Automatic tuning of the sparse matrix vector product on GPUs based on the ELLR-T approach

June 22nd, 2012Abstract:

A wide range of applications in engineering and scientific computing are involved in the acceleration of the sparse matrix vector product (SpMV). Graphics Processing Units (GPUs) have recently emerged as platforms that yield outstanding acceleration factors. SpMV implementations for GPUs have already appeared on the scene. This work is focused on the ELLR-T algorithm to compute SpMV on GPU architecture, its performance is strongly dependent on the optimum selection of two parameters. Therefore, taking account that the memory operations dominate the performance of ELLR-T, an analytical model is proposed in order to obtain the auto-tuning of ELLR-T for particular combinations of sparse matrix and GPU architecture. The evaluation results with a representative set of test matrices show that the average performance achieved by auto-tuned ELLR-T by means of the proposed model is near to the optimum. A comparative analysis of ELLR-T against a variety of previous proposals shows that ELLR-T with the estimated configuration reaches the best performance on GPU architecture for the representative set of test matrices.

(Francisco Vázquez and José Jesús Fernández and Ester M. Garzón: *“Automatic tuning of the sparse matrix vector product on GPUs based on the ELLR-T approach”*, Parallel Computing 38(8), 408-420, Aug. 2012. [DOI])

## Frequent Items Mining Acceleration Exploiting Fast Parallel Sorting on the GPU

June 20th, 2012Abstract:

In this paper, we show how to employ Graphics Processing Units (GPUs) to provide an efficient and high performance solution for finding frequent items in data streams. We discuss several design alternatives and present an implementation that exploits the great capability of graphics processors in parallel sorting. We provide an exhaustive evaluation of performances, quality results and several design trade-offs. On an off-the-shelf GPU, the fastest of our implementations can process over 200 million items per second, which is better than the best known solution based on Field Programmable Gate Arrays (FPGAs) and CPUs. Moreover, in previous approaches, performances are directly related to the skewness of the input data distribution, while in our approach, the high throughput is independent from this factor.

(Ugo Erra, Bernardino Frola: *“Frequent Items Mining Acceleration Exploiting Fast Parallel Sorting on the GPU”*, Procedia Computer Science 9, pp 86-95 (Proceedings of the International Conference on Computational Science), 2012. [DOI])

## GPU Accelerated Multi-agent Path Planning Based on Grid Space Decomposition

June 20th, 2012Abstract:

In this work, we describe a simple and powerful method to implement real-time multi-agent path-ﬁnding on Graphics Processor Units (GPUs). The technique aims to ﬁnd potential paths for many thousands of agents, using the A* algorithm and an input grid map partitioned into blocks. We propose an implementation for the GPU that uses a search space decomposition approach to break down the forward search A* algorithm into parallel independently forward sub-searches. We show that this approach ﬁts well with the programming model of GPUs, enabling planning for many thousands of agents in parallel in real-time applications such as computer games and robotics. The paper describes this implementation using the Compute Uniﬁed Device Architecture programming environment, and demonstrates its advantages in GPU performance compared to GPU implementation of Real-Time Adaptive A*.

(Giuseppe Caggianese , Ugo Erra: *“GPU Accelerated Multi-agent Path Planning Based on Grid Space Decomposition”*, Procedia Computer Science 9, pp 1847-1856 (Proceedings of the International Conference on Computational Science), 2012. [DOI])

## Parallel Incomplete-LU and Cholesky Factorization

June 13th, 2012Abstract:

A novel algorithm for computing the incomplete-LU and Cholesky factorization with 0 fill-in on a graphics processing unit (GPU) is proposed. It implements the incomplete factorization of the given matrix in two phases. First, the symbolic analysis phase builds a dependency graph based on the matrix sparsity pattern and groups the independent rows into levels. Second, the numerical factorization phase obtains the resulting lower and upper sparse triangular factors by iterating sequentially across the constructed levels. The Gaussian elimination of the elements below the main diagonal in the rows corresponding to each single level is performed in parallel. The numerical experiments are also presented and it is shown that the numerical factorization phase can achieve on average more than 2.8x speedup over MKL, while the incomplete-LU and Cholesky preconditioned iterative methods can achieve an average of 2x speedup on GPU over their CPU implementation.

(Maxim Naumov. *Parallel Incomplete-LU and Cholesky Factorization in the Preconditioned Iterative Methods on the GPU*, NVIDIA Technical Report NVR-2012-003. May 2012.)

## New Three-part Webinar Series: OpenCL Programming on Intel® Processors

June 12th, 2012Register today up now for a webinar series on how to use the Intel® SDK for OpenCL Applications to best utilize the CPU and Intel® HD Graphics of 3rd Gen Intel® Core™ processors for developing OpenCL applications:

- July 11 – Getting Started with Intel® SDK for OpenCL Applications
- July 18 – Writing Efficient Code for OpenCL Applications
- July 25 – Creating and Optimizing OpenCL Applications

## Relational Algorithms for Multi-Bulk-Synchronous Processors

June 6th, 2012This publication describes efficient low level algorithms for performing relational queries on parallel processors, such as NVIDIA Fermi or Kepler. Relations are stored in GPU memory as sorted arrays of tuples, and manipulated by relational operators that preserve the sorted property. Most significantly, this work introduces algorithms for JOIN and SET INTERSECTION/UNION/DIFFERENCE that can process data at over 50 GB/s.

Abstract:

Relational databases remain an important application domain for organizing and analyzing the massive volume of data generated as sensor technology, retail and inventory transactions, social media, computer vision, and new fields continue to evolve. At the same time, processor architectures are beginning to shift towards hierarchical and parallel architectures employing throughput-optimized memory systems, lightweight multi-threading, and Single-Instruction Multiple-Data (SIMD) core organizations. Examples include general purpose graphics processing units (GPUs) such as NVIDIA’s Fermi, Intels Sandy Bridge, and AMD’s Fusion processors. This paper explores the mapping of primitive relational algebra operations onto GPUs. In particular, we focus on algorithms and data structure design identifying a fundamental conflict between the structure of algorithms with good computational complexity and that of algorithms with memory access patterns and instruction schedules that achieve peak machine utilization. To reconcile this conflict, our design space exploration converges on a hybrid multi-stage algorithm that devotes a small amount of the total runtime to prune input data sets using an irregular algorithm with good computational complexity. The partial results are then fed into a regular algorithm that achieves near peak machine utilization. The design process leading to the most efficient algorithm for each stage is described, detailing alternative implementations, their performance characteristics, and an explanation of why they were ultimately abandoned. The least efficient algorithm (JOIN) achieves 57% − 72% of peak machine performance depending on the density of the input. The most efficient algorithms (PRODUCT, PROJECT, and SELECT) achieve 86% − 92% of peak machine performance across all input data sets. To the best of our knowledge, these represent the best known published results to date for any implementations. This work lays the foundation for the development of a relational database system that achieves good scalability on a Multi-Bulk-Synchronous-Parallel (M-BSP) processor architecture. Additionally, the algorithm design may offer insights into the design of parallel and distributed relational database systems. It leaves the problems of query planning, operator→query synthesis, corner case optimization, and system/OS interaction as future work that would be necessary for commercial deployment.

(Gregory Diamos, Ashwin Lele, Jin Wang, Sudhakar Yalamanchili: *“Relational Algorithms for Multi-Bulk-Synchronous Processors “*, NVIDIA Tech Report, June 2012. [WWW])

## 5th Workshop on UnConventional High Performance Computing 2012

June 3rd, 2012Together with EuroPar-12, the 5th Workshop on UnConventional High Performance Computing 2012 (UCHPC 2012) will take place on August 27/28 at Rhodes Island, Greece. The workshop tries to capture solutions for HPC which are unconventional today but could become conventional and significant tomorrow. While GPGPU is already used a lot in HPC, there still are all kind of issues around best exploitation and productivity for the programmer. Submission deadline: June 6, 2012. For more details, see

http://www.lrr.in.tum.de/~weidendo/uchpc12. **UPDATE**: Submission deadline extended to June 11.

## VexCL: Vector expression template library for OpenCL

May 30th, 2012VexCL is vector expression template library for OpenCL developed by the Supercomputer Center of Russian academy of sciences. It has been created for ease of C++ based OpenCL development. Multi-device (and multi-platform) computations are supported. The code is publicly available under MIT license.

Main features:

- Selection and initialization of compute devices according to extensible set of device filters.
- Transparent allocation of device vectors spanning multiple devices.
- Convenient notation for vector arithmetic, sparse matrix-vector multiplication, reductions. All computations are performed in parallel on all selected devices.
- Appropriate kernels for vector expressions are generated automatically first time an expression is used.

Doxygen-generated documentation is available at http://ddemidov.github.com/vexcl/index.html.

## C++ AMP Courses

May 26th, 2012C++ Accelerated Massive Parallelism (C++ AMP) is a new open specification heterogeneous programming model, which builds on the established C++ language. Developed for heterogeneous platforms C++ AMP is designed to accelerate the execution of C++ code by taking advantage of the data-parallel hardware that is commonly present as a GPU. These courses are aimed at programmers who are looking to develop comprehensive skills in writing and optimizing applications using C++ AMP. Read the rest of this entry »